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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b64772e61e756153302aa229a5d89d1c02ada3d17fef6f403f350406bb59fb' 
  AND token = 'dTHRXbsArFk4cM+il30oMtv0PrLnrbSQ//rzIup2uCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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