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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b5f03f08ac141edd4a8a6a7ebc1a933d464d6bdf70fee0adbc2e1d3f3b5957' 
  AND token = 'WJQUc1rr7FQKxECK/Dk3tYKh131Pm1nl9Hok2bc8lYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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