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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447b35b706f6b655514b2b31e1dae399ae85516793c5174499ea2abaec926626' 
  AND token = 'Lb2ebhYaE89mB/IbPtaQ0aRFQs1+ES7p5qczvFSFwD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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