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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e2c496af7ae1323007b3f3dbd419ffc2dffc4fcc94ca58c6637f415af5807a' 
  AND token = 'EKB2cpnURLVVgDjYQNcKVDTRTD5vgxgW3YxJ5QZKc6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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