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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60905c369b869d3e52b8ec60dbc2c50cb7522a486c6336cfcb08b4ed67d78abd' 
  AND token = 'ZX8wjKUcCCL4r9dlSbPiC8MYoMlJwK8fYbV9mlvsIoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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