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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1d8c47bcf1b1c4f6256a1567b41c475ceaf156a1300eec8ecade5499a101fe' 
  AND token = '4Nrm3maQL2DAGmtOTTlV6mQEodzTf/OYMuS0AhJlA+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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