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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39973974bfd32d0c4fb1f2bb942e9eb3bb1599af7b57a99f4fd36ed871798533' 
  AND token = '233R6P6Omgk9058YDG0Wp0/dxsaC38ax2Z1FM2alvAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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