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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6f8e952b94a98f01acabc5f052e53c90d0df22ed99af6754f948ffec7ef8f6' 
  AND token = '+1PQ2/LNkGCVMD2mi0jAN67Q2NIA5opjn/rexqog4yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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