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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9de93125de008bd267c883297d9ffe100cd00dec6f3af7a94426d89975c8f5d3' 
  AND token = '7WiFY+ou0s44wO1BxANXhYr6gl/Jx5oSGd5mwwfErLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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