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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e89fac72455497345ddc72bc9fad96e85555f60a8f54818c08a535e58b9471' 
  AND token = 'MoU8F4J1oOtYuFMbE+3O67Zqgzrn7YxWtRMa1SUcsvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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