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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c9bdb0bf4b6b6690d16220d8e442850df277299a75351c83c12ddc78fcfb65' 
  AND token = '+8A1H7OXIjTrwGMzbil5+eb+f354t3qNJR1KC2ImIkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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