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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e458a8bbc076c80eb2a620f22cd13985c1342f9a93a14226e04e844671b38874' 
  AND token = 'nRB+1gTkrJj4T5iUZ66dWxfYB1/PMuyhEHs77D1HQRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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