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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7777225eb65567670ecfc21d4c611681c3ddd34d8bb3b56ceda87858803a76' 
  AND token = 's9VeNWeN43Eyeni5Nvu6WlFENdl2vDXypG4gIPbrkjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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