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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68300a8c982f937dc743769e2d18a363ab72aadfc199aff6858bc241310d3b43' 
  AND token = 'w5kpZqIdGsq5/oXcBo98xCwal94xdAQFZJip0WAb3Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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