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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5643e0e8ceec06c1bb78e54d2ae894c1834796a945e497ce1091afc12008c2' 
  AND token = 'b6gHUs/QTo3nG4bRbyKsOjcX+HWSSxNikx6tRe8Z5H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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