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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c0bf2c9ff01adec186d8ad31ed2c19d91ea0514684689ad0d6f26263184249' 
  AND token = 'dcz9obW/iVLj7hMCl8zS7/NfyAHE1okUOkxfzbrq/5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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