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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86aed6652775e55297bec4c636d1bf9d265a80fd526c39b6c7c759fbd9ec26de' 
  AND token = 'bj6kndcDUuDjv44Sm8HsDpIaUwjxwmFicwSAcpNV4XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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