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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5007137d6e45c25ae8f518ad3078e486ef8ba29a00ef79aa627999cbde43975c' 
  AND token = '3CjF1yvgBgNXFm+TMafo99K9hG9a0QMrvIZjttJK63c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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