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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '245154543ff8cd8c28f4190a8e2578875cfd028610b832d0ce252d4ecd46e743' 
  AND token = 'a1ehjmXTHwO+9GaO6eWRlowceOb/HuabpOch7PBd59c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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