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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0156c04a2ccbee0e4413ab2d68fcf9747e8fec08cdf573bb8ddd30f6523a0284' 
  AND token = 'Dgp4+uEHIHXBXJo8qD4YmAwUsDHP/kM1Os3JheNNIqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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