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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ad165b57fdba518c8880d8b16cd22aa3fa6f1a2455db4b5a9ce2b648ff9e8e' 
  AND token = 'P2e88VQH1VBoGhsQ2ya92l/REGElNxyzM9M9aT1/ZJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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