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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ebd708a4c6f795adbd83c8f9fb4b79c082b2cbb0f05ddb91f97dd877eb6d4f' 
  AND token = 'oTYLbMqUTYxqqa5cvPg3JX8dF0AE2mm+duBD4M2sp0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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