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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ae42f074cca14c3e0b466fce72f0f3e56afe12f832b6cc673ee0c55e186326' 
  AND token = 'VgpDp5AFRgpkqbgKkalmwAllCHF5MAYFQ2o+vLavWOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}