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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eabf4b2f25e06abf9b81e526deb1ebbcc90e382b1c56cb07b57f6a149d59e64' 
  AND token = 'r25cdGDjHJks2gf40elB5c1CKxGOYiWZk013ePLN2xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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