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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae8e8206574b640b91fab52db8c83cd28ef1b3e345518de9b2796ea4aec22a7d' 
  AND token = '8rpO6t3Hce8Wkqsa5R+y1lfz0rfcSvRdawK6QW68R54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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