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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a26a3d89fee46dc64e48aa3129000caeecbea5ebbf56d1382d6d8ffec35df01' 
  AND token = 'L9kAxJvSPDoAwOGnjxlPc3uJ1sst882ULIKpziPN2Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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