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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e67b1c0756d3a2388de79eea099dd943c38db03f4a2570479faee34d8c4952' 
  AND token = 'uKMQi6q7xezbua2veENysMDjzLDTh4V3ZfZ44/13E+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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