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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0a55da2fe3c8cc7c5f2dc9af1cbc4aa943c9a326fa452c6507de7da42fedb9' 
  AND token = 'WG2TK2Q0jGHwDy9kZJB8Yf59pKS8+NdJ/oqvXU0eKR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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