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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d7452e2e8586b8767e92789f8b47c54681fb2d43cf177381b6caddd57d3787' 
  AND token = 'taYQw+ruYrfAD2B1E3fQel3rHcnF1HnM56fVRgQvxVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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