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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95700bec4917c02cccb482cd74f5c15235c2ce09c04805eaebafb50d75d5cac' 
  AND token = 'uOWs3EfNntv5Pr8KO0p8KEdXdUfPm4Ctl3IK8mxd7Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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