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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb4a5e9a9b936aa2f23b3ea92d3d1237a14f5916ab5ac88b3fed55cc1a0105d' 
  AND token = 'XuFq1gwCqdvsI4/PW2NiRV2PDI70n+NcsxF0kZWkm6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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