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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b8468596977435ac05d4106189d49b4984d21cf12566fcaed0e678074b3815' 
  AND token = 'HqVK13d9rpw3EZRJ/kOS4XXSD2cEII2jy0O78pHsIx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00209

JSON explain

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