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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9670e3b24562b9bb5b7fc39382db0307ff4e5667a4a21db3e06a33235c72ecb' 
  AND token = 'i6yBBD9D05D06IoSoHsL82GGH/WnOoA+6mpnWZ3uD/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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