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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a0c2db0ede5bf117dd960dea621bd4e3bc6f7085d2705b4a0414fd26009cfe' 
  AND token = 'PI1xLzPkMHtY2l4QhSVbJxZdLK4n2saRqBIUX7p6oDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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