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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60f8938378535466c15607b6017e29159c8d045f56dbaf198c135df3e7ef5e4' 
  AND token = '7cUfb4UtI88lzEl4ZtrH10dTc2ivK+S/7qtnM8crwwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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