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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa9a2eca1169ee2fffe1ee73fc16c79bad88fc1cd6c2e74b70d422e25ac43f3' 
  AND token = 'sxDUchCkf4fukFU1I5q/j4+SEI8UvysE6OGe7I9S2B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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