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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530a2e18cb7569ef615e78bfd6a90a4c31d4bd319ad845a66eb1a3c49734ef6b' 
  AND token = 'zoe7ddyJDIQ7HcJTFwqPtVIqCNi+rZ5Z1t8zy4oCHKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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