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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b947a04d4a7f93657651fbaaf8c3c44f210779f8944aa59d159ee8115eea6f27' 
  AND token = 'bkUBsaSlENhHciZADuAzB1ACtyqv+PDI3OqRs+8llto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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