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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b97f178683e9834adb4e304d54f26f058890611768c4f47ee53c4882b82f2eb' 
  AND token = 'Sb3lf6h94sBEjNbes0B3JYQ0Vy97vIHvT/YbPooZr9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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