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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a8632535c27f9cdb30b20e3656e8f593ef40b9866a536ca5bc2c3dd1135ce0' 
  AND token = 'FYr98ppvlQ0atangs0auVssa8kdL0DBh0WpPz/yXeM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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