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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542b2b326b06f6c2d45a8a91645e14e3e1b14fc22c751fc36dc85ef50c5bf94f' 
  AND token = '0Tt7CMME8BEG/k9d9kD9CdDj/rEM+wPz3pIUWkTILpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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