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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7956199a7be0d3effc385db1d5b435ae49bfdfb3d426851a1fc80fe1ebfde24' 
  AND token = 'lZ1XagKW45bDyTAz0yPtKR84xnVBbd/HtjpmrDeO4nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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