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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5d242dc97191eaab14c679a3f1d640a8e6dfb94c500c451ba80879954823713' 
  AND token = 'FxgmSb3xadb7BrxIh58N2RdTscgEJzGhxuHRCLFKGFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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