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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c972a5024c28161aff2a29cfe2b9539c26bb7d45a0e3f7e77d530701d66d86a9' 
  AND token = 'avJe5zJI44woaZAmAxJeWawl7ZZYcMM37JJ2iQEN7zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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