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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d140d1d513734cb8c8f3d460c7c652966f83789b031823d322dc8005d8f425' 
  AND token = 'yt5v8AVu6CTX7Kvd9MB0uWjB1oCTT04bj9VhPOecOi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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