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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee7e652f190f71d9c22df35be53b18782685501b51caf5e3e29e4ecc2c9e926' 
  AND token = '7kCpYeMDemKYJeKUOgTUZdv6Z6v7Q8DPN/DTeQMBX2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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