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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c3cddd3c2afd1a10fbe337fe78689ef551a2ecb4b48ceb6849beb510ab51b80' 
  AND token = 'ZMNmzx2kj6Ed3Wv7yJyT2sOvl1QQ+P3wAL4/ISOoaRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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