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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b06dd89b46192a742a961ff45da28bc5be7841ff8428ce762159f3f9275e336' 
  AND token = 'r6N20fVGiS2MXCPq4eetsas8Ea5RPsXULAA/CeOWPG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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