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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd52f3484fa50919640074c08955ee5825f128cf3d681139ee1cd25c5aab9c9f' 
  AND token = 'o1O1x60R9V3tKDQ40xtE128b2YonQ25e58rLweWzT6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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