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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd8c1fdcc867632ad8eb9413d93a3ddcdf46a4b129261e7b34ec88bba62e558' 
  AND token = 'mRnEuiTYyPmTB87xH4wZQZNY6rsV6ycLML88a8vjFcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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