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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c80741e7dec9589de022ea5b692fe3bb2fe0bb408637a0258bf590f3175817' 
  AND token = 'Z6f+RKy+hx07v/jfuXM3X+j+MgHY57sHUrrRCYCcE/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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