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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2543d2e3f072193e9c0ac2049afdc5d3494094792ce6b4607f345b995344f2e4' 
  AND token = '3lQN4CX4hXw419nBgcNOv4/8dDb+qjuEXd6puCdJGqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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