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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32581d196f57d2b774ca30ee258f9a3509b1ff9968bfae87d3aeaf2e3a625382' 
  AND token = 'v17bP0CCql2TfyHWoefXIR32mfF5nln/ak9KoQ8hHtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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