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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bdbb48d1d20d74b09988558ddcc4c551ddb5de5f11b2fd3a91a0dfc7641469a' 
  AND token = 'y+lK4zd/I3cO5OpxtOJRotN9RK4D8OJSG8ha/L2q3C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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